JP6225796B2 - Construction machinery - Google Patents

Description

  The present invention relates to a construction machine having a reducing agent tank that stores a liquid reducing agent for reducing nitrogen oxides in exhaust gas.

  2. Description of the Related Art Conventionally, a construction machine including an upper frame provided on a lower traveling body and a reducing agent tank provided on the upper frame is known.

  In this type of construction machine, when it is detected that the concentration of the liquid reducing agent in the reducing agent tank is not within a preset concentration range, the liquid reducing agent in the reducing agent tank is derived and a new one is introduced. Replenishment with a liquid reducing agent is performed.

  Here, as a configuration for deriving the liquid reducing agent from the reducing agent tank, for example, a configuration described in Patent Document 1 for draining water from the fuel tank can be employed.

  Specifically, the turning work machine described in Patent Literature 1 includes a fuel tank having a drain port, a drain cock, and a hose that connects the drain port and the drain cock.

  The fuel tank and the drain cock are fixed to the upper frame while being placed on the bottom plate of the upper frame (swivel base).

  In the swivel work machine described in Patent Document 1, an operator located on the ground operates the drain cock and performs work for receiving water derived from the drain cock (for example, installation of a container such as a bucket). Thus, water can be drained from the fuel tank.

  By the way, as described in Patent Document 2, due to layout restrictions on the upper frame, a reducing agent tank must be placed on equipment (a fuel tank in Patent Document 2) provided on the upper frame. There is a case.

Japanese Patent No. 5154393 JP 2011-64132 A

  For the construction machine described in Patent Document 2, it is conceivable to adopt the configuration described in Patent Document 1 in which the drain cock is disposed on the same plane as the tank. In this case, the drain cock is also disposed on the fuel tank. The Therefore, the work for receiving the liquid reducing agent derived from the drain cock needs to be performed at a high place, and workability is reduced.

  On the other hand, it is also conceivable to extend the hose and fix the drain cock on the bottom plate of the upper frame. In this case, the worker on the ground receives the liquid reducing agent derived from the drain cock (container Etc.) can be performed.

  However, in this case, a relatively long hose corresponding to the height of the device (fuel tank) is interposed between the reducing agent tank and the drain cock. Therefore, a relatively large amount of liquid reducing agent filled in the hose in a state where the reducing agent tank contains the liquid reducing agent may freeze in a low temperature environment.

  The reducing agent tank is usually provided with a means for thawing the liquid reducing agent in the reducing agent tank, but even if this means is used, the liquid reduction frozen in a relatively long hose as described above. There is a problem that it takes time to thaw the agent. Furthermore, the hose may be damaged due to expansion of the liquid reducing agent during freezing.

  An object of the present invention is to provide a construction machine capable of suppressing freezing of a liquid reducing agent while suppressing a decrease in workability for deriving the liquid reducing agent in a state where the reducing agent tank is provided on the equipment. is there.

  In order to solve the above-described problems, the present invention provides a construction machine, which is a lower traveling body, an upper frame provided on the lower traveling body, an apparatus provided on the upper frame, A reductant tank provided on the apparatus, capable of storing a liquid reductant for reducing nitrogen oxides contained in the exhaust gas, and having an outlet for deriving the liquid reductant; A reducing cock provided to the outlet of the reducing agent tank; an upper end connected to the outlet cock; and a lower end provided at a position lower than the outlet cock; There is provided a construction machine comprising a guide hose arranged to be able to guide the liquid reducing agent therein to its lower end by its own weight.

  According to the present invention, since the liquid reducing agent in the reducing agent tank can be guided to the lower end portion of the guide hose provided at a position lower than the outlet cock, the operator can reduce the liquid reducing agent at a position lower than the outlet cock. An operation for receiving the agent (for example, an operation of installing a container such as a bucket) can be performed.

  Further, since the guide hose is provided on the downstream side of the outlet cock, the outlet cock is closed after the liquid reducing agent is led out, and after the liquid reducing agent is replenished in the reducing agent tank, the liquid in the guide hose The reducing agent is never filled. Therefore, it is possible to prevent the liquid reducing agent from freezing in the guide hose in a state where the liquid reducing agent is stored in the reducing agent tank.

  Therefore, according to the present invention, freezing of the liquid reducing agent can be suppressed while suppressing a decrease in workability for deriving the liquid reducing agent.

  In the present invention, “arranged so that the liquid reducing agent in the reducing agent tank can be guided to the lower end by its own weight” means that the lower end side of the guide hose is closer to the lower end side. It means that the guide hose is arranged so that the portion is lower.

  Here, the guide hose may be inclined so that the lower end portion is lower than the upper end portion of the guide hose, but in this case, the plane for routing the guide hose Space becomes larger.

  Therefore, in the construction machine, the lead-out cock is provided on a side of the device in a plan view, and has a connected portion to which an upper end portion of the guide hose is connected. It is preferable that it hangs down from the connection part.

  According to this aspect, since the guide hose can be arranged vertically, the plane space for routing the guide hose can be suppressed to an extremely narrow range.

  In the construction machine, the device is provided at an outer edge portion of the upper frame, the lead-out cock includes a valve mechanism and an operation portion for opening and closing the valve mechanism, and the operation portion is a flat surface. It is preferable that the lower end of the guide hose is disposed outside the device in a plan view while being disposed toward the outside of the upper frame in view.

  According to this aspect, the operation unit can be operated from the outside of the upper frame, and the operation for receiving the liquid reducing agent led out from the lower end of the guide hose can be performed outside the upper frame.

  Therefore, the movement distance of the worker for the operation of deriving the liquid reducing agent can be shortened, and thereby the workability can be improved.

  When the upper frame has a bottom plate on which the device is placed, the lower end of the guide hose may be higher than the bottom plate if it is lower than the outlet cock. It is preferable that the lower end has a length that can be arranged at a position lower than the bottom plate.

  According to this aspect, since the lower end portion of the guide hose can be disposed at a position lower than the bottom plate, the liquid reducing agent derived from the guide hose can be received at a lower position. Therefore, for example, work (such as installation of a container) for receiving a liquid reducing agent can be performed by an operator located on the ground, and workability is further improved.

  Note that the lower end portion of the guide hose is only required to be disposed at a position lower than the bottom plate at the time of the liquid reducing agent deriving operation, and may be placed on the bottom plate at other times than the liquid reducing agent deriving operation. .

  ADVANTAGE OF THE INVENTION According to this invention, the freezing of a liquid reducing agent can be suppressed, suppressing the fall of workability | operativity which derives | leads out a liquid reducing agent in the state in which the reducing agent tank is provided on the apparatus.

1 is a side view showing an overall configuration of a hydraulic excavator according to an embodiment of the present invention. It is a top view which abbreviate | omits and shows a part of upper revolving body shown in FIG. It is a right view which expands and shows a part of upper revolving structure shown in FIG. It is a perspective view which expands and shows the periphery of the reducing agent tank shown in FIG. It is a front view which expands and shows the periphery of the derivation | leading cock shown in FIG.

  Embodiments of the present invention will be described below with reference to the accompanying drawings. The following embodiments are examples embodying the present invention, and are not of a nature that limits the technical scope of the present invention.

  Referring to FIG. 1, a hydraulic excavator 1 which is an example of a construction machine according to an embodiment of the present invention includes a lower traveling body 2 having a pair of crawlers 2a, and an upper portion provided on the lower traveling body 2 so as to be turnable. The revolving unit 3 and the work attachment 4 attached to the upper revolving unit 3 so as to be displaceable are provided.

  The work attachment 4 includes a boom 5 having a base end attached to the upper swing body 3, an arm 6 having a base end attached to the tip of the boom 5, and a bucket attached to the tip of the arm 6. 7.

  The work attachment 4 includes a boom cylinder 8 that drives the upper end of the boom 5 up and down relative to the upper swing body 3, an arm cylinder 9 that rotates the arm 6 relative to the boom 5, and a bucket that moves relative to the arm 6. And a bucket cylinder 10 that rotationally drives 7.

  Referring to FIGS. 1 and 2, the upper swing body 3 includes an upper frame 11 provided on the lower traveling body 2, a cab 12 and a fuel tank (an example of equipment) provided on the upper frame 11, respectively. 13, a reducing agent tank 14, an engine 15, a radiator 16, and a covering mechanism 17. In addition, it demonstrates below using the direction seen from the operator who sat on the driver's seat in the cab 12. FIG.

  The upper frame 11 includes a bottom plate 11a that is turnably attached to the lower traveling body 2, and a pair of vertical plates 11b that are erected on the bottom plate 11a. The vertical plate 11b extends in the front-rear direction while facing the left-right direction. The base end portion of the boom 5 is attached to the front end portion of the vertical plate 11b.

  The cab 12 is disposed on the left side of the left vertical plate 11 b in the front portion of the upper frame 11.

  The fuel tank 13 is provided at the right outer edge portion of the upper frame 11. Specifically, the fuel tank 13 includes a fuel tank main body 13a and a fuel filler port 13b protruding upward from the upper surface of the fuel tank main body 13a. The fuel tank body 13a extends in the front-rear direction along the right outer edge portion of the bottom plate 11a, and has a left side surface 13c disposed along the outer edge portion of the upper frame 11 in plan view. The fuel filler port 13b is provided on the upper surface of the front portion of the fuel tank body 13a.

  The reducing agent tank 14 can store a liquid reducing agent (for example, urea water) for reducing nitrogen oxides contained in the exhaust gas from the engine 15. The reducing agent tank 14 is provided on the upper surface (hereinafter also referred to as an installation surface 13d) of the fuel tank body 13a.

  Specifically, the reducing agent tank 14 includes a reducing agent tank main body 20 mounted on the installation surface 13d, a replenishment port 21 protruding leftward from the reducing agent tank main body 20, and a liquid in the reducing agent tank main body 20. A heater unit 22 for heating (thawing) the reducing agent and an outlet 23 (see FIG. 5) for leading out the liquid reducing agent in the reducing agent tank body 20 are provided. The outlet 23 is provided on the bottom surface of the reducing agent tank body 20.

  The engine 15 is provided on both vertical plates 11 b at a position behind the cab 12 and the fuel tank 13. The engine 15 extends in the left-right direction.

  The radiator 16 is for cooling the coolant and hydraulic oil of the engine 15 and is provided on the right side of the engine 15.

  The covering mechanism 17 is for covering the upper frame 11 and the equipment provided on the upper frame 11 from above and from the side. Specifically, the covering mechanism 17 includes a front cover 17 a that covers the upper frame 11 at a position in front of the fuel tank 13, and a rear cover 17 b (see FIG. 1) that covers the engine 15. The covering mechanism 17 also has an intermediate cover that covers the fuel tank 13 and the reducing agent tank 14 from above and from the side, but the illustration of the intermediate cover is omitted for convenience of explanation.

  2 to 5, the upper swing body 3 further includes a bracket 19 provided on the installation surface 13 d of the fuel tank 13, a lead-out cock 24 attached to the bracket 19, a lead-out cock 24, and a reduction A connecting hose 25 for connecting the agent tank 14 and a guide hose 18 for guiding the liquid reducing agent led out from the lead-out cock 24 downward are provided.

  The outlet cock 24 is connected to the outlet 23 of the reducing agent tank 14 via a connection hose 25. The outlet cock 24 has a valve body 24a having a valve mechanism that can be switched between an open state in which the guide hose 18 and the reducing agent tank 14 communicate with each other, and a closed state in which the guide hose 18 and the reducing agent tank 14 are closed. The operation part 24b for this and the to-be-connected part 24c to which the guide hose 18 was connected are provided.

  The cock main body 24a is attached to the fuel tank 13 by the bracket 19 in a state of being located outside the reducing agent tank main body 20 and the fuel tank 13 in a plan view and inclined downward toward the outer side.

  The operation unit 24b is disposed toward the outside (right side) of the upper frame 11 (bottom plate 11a) in plan view. Specifically, the operation unit 24b protrudes outward (right side) from the tip (right end) of the cock body 24a. Moreover, the operation part 24b is arrange | positioned downward along the inclination direction of the cock main body 24a.

  The connected portion 24c protrudes downward from the lower surface of the cock body 24a.

  The guide hose 18 has an upper end portion 18a connected to the outlet cock 24 and a lower end portion 18b provided at a position lower than the outlet cock 24, and the liquid reducing agent in the reducing agent tank 14 is lowered by its own weight. It arrange | positions so that it can guide to 18b.

  Specifically, the upper end portion 18a of the guide hose 18 is connected to the connected portion 24c provided on the side (right side) of the fuel tank 13 in plan view as described above, and the guide hose. 18 hangs down from the connected portion 24c. Thereby, the lower end part 18b of the guide hose 18 is arrange | positioned on the outer side (right side) of the fuel tank 13 in planar view.

  Moreover, the guide hose 18 has the length which can arrange | position the lower end part 18b of the said guide hose 18 in the position lower than the baseplate 11a, as shown in FIG.

  Hereinafter, an operation for deriving the liquid reducing agent from the reducing agent tank 14 will be described.

  First, a container such as a bucket is installed at a position where the liquid reducing agent derived from the lower end portion 18b of the guide hose 18 can be received. Since the lower end portion 18b of the guide hose 18 is disposed below the bottom plate 11a as described above, for example, an operation for receiving a liquid reducing agent (such as installation of a container) is performed by an operator located on the ground. be able to.

  In this state, the operation part 24b of the outlet cock 24 is operated to open the valve mechanism of the cock body 24a. Thereby, the liquid reducing agent in the reducing agent tank 14 is led out from the lower end portion 18b of the guide hose 18 and introduced into the container.

  Since the liquid reducing agent in the reducing agent tank 14 is guided to the lower end portion 18b of the guide hose 18 by its own weight, all of the liquid reducing agent in the reducing agent tank 14, the connection hose 25, the outlet cock 24, and the guide hose 18 are all present. It is led out in a container such as a bucket.

  The liquid reducing agent can be exchanged by operating the operating portion 24b of the outlet cock 24 to close the valve mechanism of the cock body 24a and introducing the liquid reducing agent into the reducing agent tank 14 through the replenishing port 21. .

  In the state where the liquid reducing agent is replaced, there is no liquid reducing agent in the guide hose 18 located downstream of the outlet cock 24. Therefore, it is possible to prevent the liquid reducing agent from freezing in the guide hose 18.

  Here, the liquid reducing agent is filled in the range from the reducing agent tank 14 to the outlet cock 24 (in the connection hose 25), but the outlet cock 24 is provided on the fuel tank 13 in the vicinity of the reducing agent tank 14. Therefore, when the liquid reducing agent in this portion is frozen, it can be thawed by the heater unit 22 in a relatively short time.

  In the above example, the operation of replacing all the liquid reducing agents in the reducing agent tank 14 has been described. On the other hand, even when the valve mechanism of the outlet cock 24 is closed in a state where a part of the liquid reducing agent in the reducing agent tank 14 is led out, a means for introducing air from the upper end portion 18a side is provided in the guide hose 18. Thus, the liquid reducing agent in the guide hose 18 can be led out. Specifically, as the means, for example, air that allows the flow of air to the connecting portion between the upper end portion 18a of the guide hose 18 and the connected portion 24c of the outlet cock 24, while restricting the flow of the liquid reducing agent is used. For example, an introduction passage may be provided.

  As described above, the liquid reducing agent in the reducing agent tank 14 can be guided to the lower end portion 18 b of the guide hose 18 provided at a position lower than the outlet cock 24. Therefore, the worker can perform an operation for receiving the liquid reducing agent at a position lower than the outlet cock 24 (for example, an operation of installing a container such as a bucket).

  Further, since the guide hose 18 is provided on the downstream side of the outlet cock 24, the outlet cock 24 is closed after the liquid reducing agent is led out, and after the liquid reducing agent is replenished in the reducing agent tank 14, the guide hose 18 is guided. The hose 18 is not filled with the liquid reducing agent. Therefore, it is possible to prevent the liquid reducing agent from freezing in the guide hose 18 in a state where the liquid reducing agent is stored in the reducing agent tank 14.

  Therefore, freezing of the liquid reducing agent can be suppressed while suppressing a decrease in workability for deriving the liquid reducing agent.

  Moreover, according to the said embodiment, there exist the following effects.

  According to the embodiment, since the guide hose 18 can be arranged vertically, the plane space for routing the guide hose 18 can be suppressed to a very narrow range.

  According to the embodiment, the operation part 24 b is operated from the outside (right side) of the upper frame 11 and the operation for receiving the liquid reducing agent led out from the lower end part 18 b of the guide hose 18 outside the upper frame 11 is performed. It can be carried out.

  Therefore, the movement distance of the worker for the operation of deriving the liquid reducing agent can be shortened, and thereby the workability can be improved.

  According to the embodiment, since the lower end portion 18b of the guide hose 18 can be disposed at a position lower than the bottom plate 11a, the liquid reducing agent led out from the guide hose 18 can be received at a lower position. Therefore, for example, work (such as installation of a container) for receiving a liquid reducing agent can be performed by an operator located on the ground, and workability is further improved.

  Note that the lower end portion 18b of the guide hose 18 only needs to be disposed at a position lower than the bottom plate 11a at least when the liquid reducing agent is derived, and other than when the liquid reducing agent is derived (for example, the fuel tank 13 and the reducing agent When the tank 14 is covered with the intermediate cover of the covering mechanism 17 described above, the tank 14 may be placed on the bottom plate 11a. On the other hand, you may employ | adopt the covering mechanism 17 which has the intermediate | middle cover which can coat | cover the said guide hose 18 from the side, extending the lower end part 18b of the guide hose 18. FIG.

  In the above-described embodiment, the guide hose 18 hanging from the connected portion 24c of the outlet cock 24 has been described. However, the guide hose 18 has a lower portion on the lower end portion 18b side than a portion on the upper end portion 18a side. It suffices if they are arranged. In this way, the liquid reducing agent in the reducing agent tank 14 can be guided to the lower end 18b by its own weight.

  In the embodiment, the fuel tank 13 is exemplified as the device on which the reducing agent tank 14 is placed. However, the device may be another device (a radiator 16 or the like) provided on the upper frame, for example. Moreover, the base provided in order to form an installation surface on the other structure provided on the upper frame 11 can also be used as an apparatus.

  In the above embodiment, the outlet cock 24 and the reducing agent tank 14 are connected via the connection hose 25, but the outlet cock 24 and the reducing agent tank 14 may be directly connected.

  In the above-described embodiment, the entire guide hose 18 is disposed on the outer side (right side) of the fuel tank 13 in plan view. On the other hand, if only the lower end portion 18 b of the guide hose 18 is disposed outside the fuel tank 13, the liquid reducing agent derived from the lower end portion 18 b can be received outside the fuel tank 13.

  In the above-described embodiment, the operation portion 24b of the outlet cock 24 is disposed outside (on the right side) the fuel tank 13 and the reducing agent tank 14 in a plan view, but the operation portion 24b is disposed outside the upper frame 11 (in a plan view). It suffices if it is arranged toward the right side. Specifically, the operation unit 24 b can be disposed between the fuel tank 13 and the reducing agent tank 14 toward the outside of the upper frame 11. In this way, the connection hose 25 can be shortened, and the portion where the liquid reducing agent is filled outside the reducing agent tank 14 can be further reduced.

1 Hydraulic excavator (an example of construction machinery)
2 Lower traveling body 11 Upper frame 13 Fuel tank (an example of equipment)
14 Reductant tank 16 Radiator (Example of equipment)
18 guide hose 18a upper end 18b lower end 23 outlet 24 outlet cock 24a cock body (an example of a configuration having a valve mechanism)
24b Operation part 24c Connected part

Claims (4)

A construction machine,
A lower traveling body,
An upper frame provided on the lower traveling body;
Equipment provided on the upper frame;
A reducing agent tank provided on the device, capable of storing a liquid reducing agent for reducing nitrogen oxides contained in the exhaust gas, and having an outlet for deriving the liquid reducing agent;
An outlet cock provided on the device and connected to the outlet of the reducing agent tank;
It has an upper end connected to the outlet cock and a lower end provided at a position lower than the outlet cock so that the liquid reducing agent in the reducing agent tank can be guided to the lower end by its own weight. A construction machine comprising a guide hose arranged on the construction machine. The lead-out cock is provided on a side of the device in a plan view and has a connected portion to which an upper end portion of the guide hose is connected.
The construction machine according to claim 1, wherein the guide hose hangs from the connected portion. The device is provided at an outer edge of the upper frame,
The lead-out cock has a valve mechanism and an operation unit for opening and closing the valve mechanism,
The said operation part is arrange | positioned toward the outer side of the said upper frame in planar view, and the lower end part of the said guide hose is arrange | positioned on the outer side of the said apparatus in planar view. Construction machinery. The upper frame has a bottom plate on which the device is placed,
The construction machine according to claim 3, wherein the guide hose has a length that allows a lower end portion of the guide hose to be disposed at a position lower than the bottom plate.

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